The Influence Of Electro-generated Oxidation On The Polyamide Membranes In Wastewater Treatment

Electrolysis coupled with nanofiltration technology is the new process combine electrolytic oxidation with membrane treatment. First, the use of electro-catalytic oxidation of wastewater generated a large number of active free radicals, active chlorine, ozone oxidation and many other strong ability of electro-generated oxidation, it can oxidative degradation of refractory organics in wastewater, reduce the concentration of pollutants such as COD, ammonia nitrogen, kill bacteria and microorganisms in wastewater, reduce the pollution of the membrane. then, using membrane separation technology to remove the small molecular substances in the waste water and salts. Experiments show that the electric membrane coupling technology as a means of reclaimed wastewater, can make the water quality to a higher emissions standards for reuse.Aromatic polyamide nanofiltration membrane has high desalination rate, water flux, low operation pressure, excellent thermal stability, chemical stability, mechanical stability, and the good permeability etc.it is the most widely used nanofiltration membrane in industry. However, Aromatic polyamide nanofiltration membrane is restricting the develop by the properity of not resistant to oxidation. So research on the effects of electro-generated oxidation on aromatic polyamide membrane performance, explore the electro-generated oxidation on the membrane mechanism, can provide a theoretical basis for electrically coupling membrane process applications.This paper studies the effects of electro-generated oxidation on aromatic polyamide membrane performance in different oxidation intensity. And analysis the electro-generated oxidation on the aromatic polyamide nanofiltration membrane mechanism by charactered with contact angle, IR, XPS, SEM.The results show that the crosslinked polyamide membranes has better oxidation resistance to ozone, but not to chlorine. The aromatic polyamide nanofiltration membrane showed good oxidation resistance in wastewater with the ozone oxidation intensity in the range of 0~100mg·hr. The effects of active chlorine on the aromatic polyamide nanofiltration membrane increase with the increase of ClOconcentration and immersion time. The IR contrast analysis of the membrane surface shows that, in the alkaline conditions, the surface structure of aromatic polyamide membrane was influenced by ClOadsorption, improving the membrane surface hydrophilicity and increasing the membrane flux and reducing the membranes rejection.